Quantcast Valve Opening Pressure (VOP)

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FUEL SYSTEM
TESTING AND ADJUSTING
CORRECT SPRAY ANGLE
4.
If none of the orifices are plugged, rapidly pump
handle (4) to make sure there is good flow of the
test fluid at each orifice, and to make sure spray
angle is correct.
INJECTOR UNDER TEST
4. Handle. 9. Test pressure valve. 10. Rocker arm.
NOTE: If any orifices are plugged (closed), or if injector
25. Injector. 27. Injector rack.
does not have a satisfactory spray angle, do not use the
injector again.
3.
Look at load cell gauge (3).  Slowly operate
handle (4) to pump the tester and activate
III. Valve Opening Pressure (VOP)
injector (25). During each stroke, the dial needle
of load cell gauge (3) will go to a maximum
The load cell and load cell gauge of the 6V4022
pressure reading and then decrease.
Tester are used to determine (find) the valve opening
pressure of an injector. Valve opening pressure cannot
NOTE: The highest gauge readings are made with a
be measured unless the injector is disassembled, but
slow, steady movement of handle (4).  Some extra
when the load cell and the load cell gauge of this tester
practice (extra use of tester to learn better operating
are used, a measurement can be made of the force
procedure) will show that a slow, steady movement of
needed to depress (move down) the injector plunger.
handle (4) will give the highest gauge readings.
This force is in direct relation to the valve opening
pressure.
A conversion of these load cell gauge
4.
Operate handle (4)just fast enough to cause test
readings will give the valve opening pressure of an
fluid to flow through the injector tip until the
injector. All specifications for the valve opening pressure
maximum reading on load cell gauge (3) is
of an assembled injector will be given as load cell
constant.
pressure readings. It will not be necessary to make any
conversions or to have a special gauge.  It must be
remembered that the load cell gauge reading is a direct
measurement of load cell pressure, and is not a direct
measurement of valve opening pressure.
1.
Make sure that all air has been removed from
the tester and injector, and that test pressure
valve (9) is OPEN a minimum of one complete
turn. Pull injector rack (27) OUT all the way.
2.
With rocker arm (10) extended, use handle (4) to
pump the tester just fast enough to unseat
(move off its seat) the needle valve inside
injector (25). Test fluid will now move through
the injector tip.
LOAD CELL PRESSURE INDICATION
3. Load cell pressure gauge. 9. Test pressure valve.
10. Rocker arm. 25. Injector.
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